root/drivers/staging/comedi/drivers/8255.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * module/8255.h
   4  * Header file for 8255
   5  *
   6  * COMEDI - Linux Control and Measurement Device Interface
   7  * Copyright (C) 1998 David A. Schleef <ds@schleef.org>
   8  */
   9 
  10 #ifndef _8255_H
  11 #define _8255_H
  12 
  13 #define I8255_SIZE              0x04
  14 
  15 #define I8255_DATA_A_REG        0x00
  16 #define I8255_DATA_B_REG        0x01
  17 #define I8255_DATA_C_REG        0x02
  18 #define I8255_CTRL_REG          0x03
  19 #define I8255_CTRL_C_LO_IO      BIT(0)
  20 #define I8255_CTRL_B_IO         BIT(1)
  21 #define I8255_CTRL_B_MODE       BIT(2)
  22 #define I8255_CTRL_C_HI_IO      BIT(3)
  23 #define I8255_CTRL_A_IO         BIT(4)
  24 #define I8255_CTRL_A_MODE(x)    ((x) << 5)
  25 #define I8255_CTRL_CW           BIT(7)
  26 
  27 struct comedi_device;
  28 struct comedi_subdevice;
  29 
  30 int subdev_8255_init(struct comedi_device *dev, struct comedi_subdevice *s,
  31                      int (*io)(struct comedi_device *dev, int dir, int port,
  32                                int data, unsigned long regbase),
  33                      unsigned long regbase);
  34 
  35 int subdev_8255_mm_init(struct comedi_device *dev, struct comedi_subdevice *s,
  36                         int (*io)(struct comedi_device *dev, int dir, int port,
  37                                   int data, unsigned long regbase),
  38                         unsigned long regbase);
  39 
  40 unsigned long subdev_8255_regbase(struct comedi_subdevice *s);
  41 
  42 #endif